(Unicode C++) FatturaPA XML Invoice Sign+Encrypt to P7M

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system.

Note: This example requires Chilkat v9.5.0.75 or greater.

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#include <CkCrypt2W.h>
#include <CkCertW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    // Note: Requires Chilkat v9.5.0.75 or greater.

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2W crypt;

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const wchar_t *pfxPath = L"qa_data/pfx/cert_test123.pfx";
    const wchar_t *pfxPassword = L"test123";

    CkCertW cert;
    bool success = cert.LoadPfxFile(pfxPath,pfxPassword);
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Provide the signing cert (with associated private key).
    success = crypt.SetSigningCert(cert);
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Indicate that SHA-256 should be used.
    crypt.put_HashAlgorithm(L"sha256");

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    CkJsonObjectW jsonSignedAttrs;
    jsonSignedAttrs.UpdateInt(L"contentType",1);
    jsonSignedAttrs.UpdateInt(L"signingTime",1);
    jsonSignedAttrs.UpdateInt(L"messageDigest",1);
    jsonSignedAttrs.UpdateInt(L"signingCertificateV2",1);
    crypt.put_SigningAttributes(jsonSignedAttrs.emit());

    const wchar_t *inFile = L"qa_data/xml/IT01234567890_11002.xml";
    const wchar_t *sigFile = L"qa_data/fatturapa/signed.p7m";

    // Create the CAdES-BES signature, which contains the original data.
    success = crypt.CreateP7M(inFile,sigFile);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
    CkCertW encryptCert;
    success = encryptCert.LoadFromFile(L"qa_data/certs/fatturapa_cert.pem");
    if (success != true) {
        wprintf(L"%s\n",encryptCert.lastErrorText());
        return;
    }

    crypt.put_CryptAlgorithm(L"pki");

    success = crypt.SetEncryptCert(encryptCert);
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Indicate the underlying bulk encryption algorithm to be used:
    crypt.put_Pkcs7CryptAlg(L"aes");
    crypt.put_KeyLength(128);

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    // use RSAES_OAEP.  (We'll leave it set at the default value of false)
    crypt.put_OaepPadding(false);

    // Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
    // The output is PKCS7 in binary DER format.
    success = crypt.CkEncryptFile(sigFile,L"qa_output/signed_and_encrypted.p7m");
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");
    }